Just off the path from the farm is the Mine, Inside you can find nodes to breakdown and get certain ores to smelt into bars. You can travel to the mine by typing /mine in the chat.
Bars from the mine are used in rings and general crafting like tech or repair kits.
The Ore Rarity you get is based of your pickaxe rarity, so craft and dust to a higher Quality!
Your class will automatically change to Miner class when you start mining the nodes.